Pole piece, battery monomer, battery and electric device
By designing the pole piece corners as concave arc segments, the problem of pole piece folding and squeezing during winding or stacking is solved, thereby improving the battery production yield and reliability.
Patent Information
- Application Number
- CN202422332564.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-09-24
AI Technical Summary
During the battery production process, the corners of the electrode are easily folded and squeezed and damaged, resulting in a low battery production yield. In addition, the diaphragm is easily punctured during battery operation, affecting the reliability of the battery.
The pole piece corners are designed to be concave arc segments, forming missing corners to avoid folding and extrusion. The concave arc segments and straight line segments are tangent to each other to achieve a smooth transition and avoid stress concentration.
The yield rate of battery production is improved, the production of unqualified products is reduced, the reliability of battery use is enhanced, and the problem of corner folding and puncturing the diaphragm is avoided.
Smart Images
Figure CN223414089U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and more particularly to a pole piece, a battery cell, a battery, and an electrical device. Background Art
[0002] With the continuous development of new energy, batteries are widely used in vehicles to provide electric drive for vehicles.
[0003] Batteries consist of a single cell. Each cell includes a housing, an electrode assembly, and an electrolyte solution. The electrode assembly includes pole pieces. During manufacturing, the pole pieces are wound or stacked to form the assembly. However, this process can easily cause the corners of the pole pieces to fold or become crushed, thus affecting the yield rate of battery production. Utility Model Content
[0004] In view of the above problems, the present application provides a pole piece, a battery cell, a battery and an electrical device to improve the yield rate of battery production.
[0005] A first aspect of the present application provides a pole piece, comprising a pole piece body, the pole piece body comprising a first side and a second side adjacent to each other and a corner portion arranged between the first side and the second side, the corner portion comprising at least one concave arc segment concave toward the inner side of the pole piece body.
[0006] The corners of the pole piece bodies of the embodiments of the present application include concave arc segments that are inwardly recessed, forming missing corners. This prevents the corners of the pole piece bodies from folding during winding or lamination. Furthermore, because they are inwardly recessed, they are less susceptible to external forces and thus avoid damage from such forces, thereby preventing the battery from becoming a substandard product and improving the yield rate of battery production. Furthermore, the fact that the corners of the pole piece bodies are not easily folded effectively prevents the diaphragm from being punctured by the folded corners of the pole piece bodies during battery operation, thereby improving the reliability of the battery.
[0007] In some embodiments, the corner includes two concave arc segments. The corner of the pole piece body of the embodiment of the present application includes two concave arc segments, which can increase the inward concave range of the corner of the pole piece body and further reduce the possibility of the corner folding.
[0008] In some embodiments, the corner portion further includes a straight line segment disposed between the two concave arc segments, and the straight line segment and the concave arc segments are both tangent. The corner portion of the embodiment of the present application includes two concave arc segments and a straight line segment disposed between the two concave arc segments, and the straight line segment and the two concave arc segments are both tangent, which makes the surface of the corner portion smooth and avoids stress concentration.
[0009] In some embodiments, the first edge extends in the length direction of the pole piece body, and the second edge extends in the width direction of the pole piece body. The two concave arc segments include a first concave arc segment set close to the first edge and a second concave arc segment set close to the second edge. The first concave arc segment is connected to the first edge through an intermediate connecting segment.
[0010] The first concave arc segment of the corner of the embodiment of the present application is connected to the first side through the middle connecting segment, thereby avoiding the problem of the corner being folded or squeezed and damaged.
[0011] In some embodiments, the intermediate connecting segment includes a vertical connecting segment perpendicular to the first side.
[0012] The pole piece of the embodiment of the present application sets the middle connecting section as a vertical connecting section perpendicular to the first side, so that the end of the corner close to the first side is further concave inward, further avoiding the folding problem.
[0013] In some embodiments, the length of the vertical connecting segment is 0.1 mm to 60 mm.
[0014] In some embodiments, the middle connecting section includes a convex arc connecting section protruding toward the outside of the pole piece body, and the convex arc connecting section is smoothly connected to the first edge.
[0015] In the embodiment of the present application, the middle connecting section is configured as a convex arc connecting section smoothly connected to the first side, thereby achieving a smooth transition between the end and the corner of the first side and avoiding stress concentration.
[0016] In some embodiments, the radius of the convex arc connecting segment is 0.2 mm to 60 mm.
[0017] In some embodiments, the corner portion includes a concave arc segment and two convex arc segments respectively arranged on both sides of the concave arc segment, and both ends of the concave arc segment are tangent to the two convex arc segments on both sides.
[0018] The corner of the embodiment of the present application is configured to be a convex arc segment, a concave arc segment, and a convex arc segment connected in sequence, and the two convex arc segments are tangent to the first side and the second side respectively, thereby avoiding the formation of a sharp angle between the corner and the first side and the second side, and preventing stress concentration.
[0019] In some embodiments, the radius of the concave arc segment is 0.2 mm to 60 mm.
[0020] In some embodiments, the pole piece further includes a pole lug disposed on the pole piece body, wherein the pole lug is disposed on the first side; or, the pole lug is disposed on the second side.
[0021] A second aspect of the present application provides a battery cell, comprising a housing and an electrode assembly disposed within the housing. The electrode assembly comprises a pole piece.
[0022] A third aspect of the present application provides a battery comprising the above-mentioned battery cell.
[0023] A fourth aspect of the present application provides an electrical device comprising the above-mentioned battery, which is used to provide electrical energy.
[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.
[0026] Figure 1 It is a schematic structural diagram of a vehicle in some embodiments of the present application.
[0027] Figure 2 It is a schematic diagram of the exploded structure of the battery of some embodiments of the present application.
[0028] Figure 3 This is a schematic diagram of the main structure of the pole piece in some embodiments of the present application.
[0029] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of the corner of the pole piece shown.
[0030] Figure 5 It is a schematic diagram of the main structure of the pole pieces of other embodiments of the present application.
[0031] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of the corner of the pole piece shown.
[0032] Figure 7 This is a schematic diagram of the main structure of the pole pieces of some other embodiments of the present application.
[0033] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of the corner of the pole piece shown.
[0034] Figure 9 It is a schematic diagram of the main structure of the pole pieces of other embodiments of the present application.
[0035] Figure 10 yes Figure 9Schematic diagram of the enlarged structure of the corner of the pole piece shown.
[0036] In the drawings, the drawings are not drawn to scale.
[0037] 2000. Vehicle.
[0038] 1000. Battery.
[0039] 200, battery box; 210, lower box body; 220, upper box body.
[0040] 100. Battery module.
[0041] 10. Pole.
[0042] 1. Pole piece body; 11. First side; 12. Second side; 13. Corner; 131. Concave arc segment; 131a. First concave arc segment; 131b. Second concave arc segment; 132. Straight line segment; 133. Vertical connecting segment; 134. Convex arc connecting segment; 135. Convex arc segment.
[0043] 2. Ear tabs. DETAILED DESCRIPTION
[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.
[0045] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.
[0046] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0047] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.
[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).
[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0050] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.
[0051] Currently, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, their market demand is also growing.
[0052] The power-consuming device in the embodiments of the present application can be a mobile device such as a vehicle, a ship, or a small aircraft. Taking a vehicle as an example, the vehicle in the embodiments of the present application can be a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Figure 1A vehicle 2000 is shown using a battery 1000 as a power source. Battery 1000 is disposed within vehicle 2000. A drive motor is provided within vehicle 2000, electrically connected to battery 1000. Battery 1000 provides electrical energy to the drive motor, which is then connected to the wheels via a transmission mechanism to propel the vehicle forward. Specifically, battery 1000 may be disposed horizontally at the bottom of vehicle 2000.
[0053] The battery 1000 of the embodiment of the present application includes at least one battery module 100. Specifically in this embodiment, Figure 2 As shown, the battery 1000 of this embodiment includes a battery module 100 and a battery box 200 for accommodating the battery module 100. The battery box 200 has an accommodating cavity, and the battery module 100 is arranged in the accommodating cavity. Figure 2 In the illustrated embodiment, the battery case 200 includes a lower case 210 and an upper case 220 that cover each other. The upper case 220 and the lower case 210 together define a storage space for the battery module 100. Of course, in other embodiments, the battery 1000 may further include a cover that covers the lower case 210. The cover may, for example, be a plate-shaped structure. Of course, the battery case 200 may have a variety of shapes, such as a rectangular parallelepiped or a cylinder.
[0054] refer to Figure 3 The battery module 100 includes multiple battery cells. These cells are electrically connected via connectors. These cells can be connected in series, in parallel, or in a hybrid configuration. Of course, the term "battery module" simply describes an array of multiple battery cells. A battery module can be formed by first connecting multiple battery cells in series, in parallel, or in a hybrid configuration, and then further connecting multiple battery modules in series, in parallel, or in a hybrid configuration to form a complete battery. A battery module can also refer to a battery pack.
[0055] A battery cell is the smallest unit that makes up a battery module. A battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery. This is not limited to the embodiments of the present application.
[0056] A battery cell includes a housing, an end cap, an electrode assembly, and other functional components. The housing is a component used to cooperate with the end cap to form an internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The housing and the end cap can be independent components, and an opening can be provided on the housing, and the internal environment of the battery cell can be formed by closing the opening with the end cap. The housing can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present disclosure do not impose any special restrictions on this.
[0057] The electrode assembly is the component within a battery cell where the electrochemical reaction occurs. The housing may contain one or more electrode assemblies. The electrode assembly is primarily composed of positive and negative electrode sheets, wound or stacked. During the battery's charge and discharge processes, the positive and negative electrode active materials react with the electrolyte, and the tabs connect to the electrodes to form a current circuit. The electrode assembly can be a wound or laminated structure, but the embodiments of this application are not limited thereto.
[0058] The pole piece is a sheet-like structure. During the process of winding or stacking at least two pole pieces, the corners of the pole piece are prone to folding, squeezing and damage, which in turn causes a reduction in the yield.
[0059] To solve the above problems, some embodiments of the present application propose a pole piece, the corners of which include concave arcs, so as to avoid the pole piece body from being folded or squeezed and damaged during the winding or stacking process, thereby improving the yield rate of battery production.
[0060] The following is based on Figures 3 to 10 The structure and working process of the explosion-proof valve in some embodiments of the present application are described in detail.
[0061] refer to Figures 3 to 10 The pole piece 10 provided in some embodiments of the present application includes a pole piece body 1. The pole piece body 1 includes a first side 11 and a second side 12 disposed adjacent to each other, and a corner portion 13 disposed between the first side 11 and the second side 12. The corner portion 13 includes at least one concave arc segment 131 concave toward the inner side of the pole piece body 1.
[0062] The pole piece 10 of the embodiment of the present application is a sheet-like structure. Figure 3 The main structural diagram of the pole piece 10 is shown, that is, the orthographic projection of the pole piece 10, and the orthographic projection refers to the projection of the pole piece 10 on its central plane. The pole piece 10 includes a pole piece body 1 and a pole ear 2. The pole ear 2 is arranged on the pole piece body 1. The orthographic projection of the pole piece body 1 is roughly rectangular, and includes two first sides 11 arranged opposite to each other and two second sides 12 arranged opposite to each other. The first side 11 extends along the longitudinal direction X, and the second side 12 extends along the transverse direction Y. The first side 11 and the second side 12 are adjacent to each other and perpendicular to each other. The first side 11 and the second side 12 are connected by a corner 13. The pole piece 10 is a sheet-like structure with a certain thickness, so the corner 13 is also a surface structure. In the description of this embodiment, the shape of the orthographic projection of the corner 13 is used for description, refer to Figure 3 The corner 13 includes a concave arc segment 131 that is concave toward the inner side of the pole piece body 1. This makes the corner 13 of the pole piece body 1 concave inward, resulting in a missing corner, thereby avoiding the problem of folding or extrusion damage. Figure 3In the embodiment shown, the pole piece body 1 includes four corners 13, each of which is formed as an inwardly concave notch and includes a concave arc segment 131. However, in other embodiments, some of the corners 13 may be notched.
[0063] The above-mentioned corner portion 13 is provided between the first side 11 and the second side 12 of the pole piece body 1 of the embodiment of the present application. The first end of the corner portion 13 is connected to the first side 11, and the second end of the corner portion 13 is connected to the second side 12, that is, the corner portion 13 extends from the first side 11 to the second side 12. The corner portion 13 includes a concave arc segment 131. The concave arc segment 131 is at least a part of the corner portion 13. For example, in some embodiments not shown in the accompanying drawings, the corner portion 13 is a concave arc segment 131 extending from the first side 11 to the second side 12. For another example, Figures 3 to 10 In each of the illustrated embodiments, a portion of the corner portion 13 is a concave arc segment 131 .
[0064] The corner 13 of the pole piece body 1 of the embodiment of the present application includes a concave arc segment 131, which is concave inward to form a missing corner. In this way, during the winding or stacking process of the pole piece, the corner of the pole piece body 1 is not easily folded. Moreover, because it is concave inward, it is not easily squeezed by external forces and thus avoids damage under external pressure, thereby preventing the battery from becoming a substandard product and improving the yield rate of battery production. In addition, the corner of the pole piece body 1 is not easily folded, which can effectively prevent the problem of puncturing the diaphragm due to the folding corner of the pole piece body 1 during battery operation, thereby improving the reliability of the battery.
[0065] refer to Figures 3 to 8 In some embodiments, the corner portion 13 includes two concave arc segments 131 .
[0066] like Figure 3 and Figure 4 As shown, in some embodiments, the corner portion 13 includes two concave arc segments 131, and the two concave arc segments 131 are connected by a straight line segment 132. Figure 5 and Figure 6 As shown, the corner portion 13 includes two concave arc segments 131 and a straight line segment 132 disposed between the two concave arc segments 131. A vertical line connecting segment 133 is disposed between one of the concave arc segments 131 and the first side 11. Figure 7 and Figure 8 As shown, the corner portion 13 includes two concave arc segments 131 and a straight line segment 132 disposed between the two concave arc segments 131. A convex arc connecting segment 134 is disposed between one of the concave arc segments 131 and the first side 11.
[0067] The corner 13 of the pole piece body 1 in the embodiment of the present application includes two concave arc segments 131 , which can increase the inward concave range of the corner 13 of the pole piece body 1 and further reduce the possibility of the corner folding.
[0068] refer to Figure 3 and Figure 4 In some embodiments, the corner portion 13 further includes a straight line segment 132 disposed between the two concave arc segments 131. The straight line segment 132 is tangent to the concave arc segments 131.
[0069] like Figure 3 and Figure 4 As shown, one of the two concave arc segments is directly connected to the first side 11, and the other concave arc segment is directly connected to the second side 12. The two concave arc segments are connected by a straight line segment 132. In this way, the portion of the corner 13 close to the first side 11 is a concave arc segment 131, and the portion of the corner 13 close to the second side 12 is another concave arc segment, that is, the two ends of the corner 13 are concave inward, and the middle part of the corner 13 is formed into a straight line segment 132. Since the two ends of the corner 13 are parts that are easily subjected to external forces, the two ends are set as concave arc segments to avoid damage caused by external force. The corner 13 is formed into a notch, which can improve the problem of easy folding. Therefore, the middle part of the corner 13 is set as a straight line segment without further concave inward, which can improve the easy folding without affecting the energy density of the battery.
[0070] The corner portion 12 of the embodiment of the present application includes two concave arc segments 131 and a straight segment 132 arranged between the two concave arc segments 131, and the straight segment 132 is tangent to the two concave arc segments 131, so that the surface of the corner portion 12 is smooth and stress concentration is avoided.
[0071] refer to Figure 5 and Figure 6 as well as Figure 7 and Figure 8 In some embodiments, the first side 11 extends along the length direction X of the pole piece body 1. The second side 12 extends along the width direction Y of the pole piece body 1. The two concave arc segments 131 include a first concave arc segment 131a disposed near the first side 11 and a second concave arc segment 131b disposed near the second side 12. The first concave arc segment 131a is connected to the first side 11 via an intermediate connecting segment.
[0072] like Figure 5 and Figure 6As shown, the first side 11 extends along the length direction X, and the second side 12 extends along the width direction Y. The first concave arc segment 131a is disposed near the first side 11, and the second concave arc segment 131b is disposed near the second side 12. The second concave arc segment 131b is connected to the second side 12, and the first concave arc segment 131a is connected to the first side 11 via a perpendicular connecting segment 133.
[0073] like Figure 7 and Figure 8 As shown, in this embodiment, the first concave arc segment 131 a is connected to the first edge 11 through a convex arc connecting segment 134 .
[0074] The first concave arc segment 131a of the corner portion 13 of the embodiment of the present application is connected to the first side 11 through the middle connecting segment, thereby preventing the corner portion from being folded or squeezed and damaged.
[0075] refer to Figure 5 and Figure 6 In some embodiments, the middle connecting segment includes a vertical connecting segment 133 perpendicular to the first side 11 .
[0076] like Figure 5 and Figure 6 As shown, the vertical connecting segment 133 is connected to the first concave arc segment 131 a and extends along the width direction Y.
[0077] The pole piece 10 of the embodiment of the present application sets the middle connecting section as a vertical connecting section 133 perpendicular to the first side 11, so that the end of the corner 13 close to the first side 11 is further concave inward, further avoiding the folding problem.
[0078] In some embodiments, the length of the vertical connecting segment 133 is 0.1 mm to 60 mm.
[0079] The length of the vertical connecting section 133 can be adaptively adjusted within the above range according to the size of the pole piece body 1 .
[0080] refer to Figure 7 and Figure 8 In some embodiments, the middle connecting section includes a convex arc connecting section 134 protruding toward the outside of the pole piece body 1. The convex arc connecting section 134 is smoothly connected to the first edge 11.
[0081] In the embodiment of the present application, the middle connecting section is configured as a convex arc connecting section 134 smoothly connected to the first side 11 , thereby achieving a smooth transition between the end and the corner of the first side 11 and avoiding stress concentration.
[0082] In some embodiments, the radius of the convex arc connecting segment 134 is 0.2 mm to 60 mm.
[0083] refer to Figure 9and Figure 10 In some embodiments, the corner portion 13 includes a concave arc segment 131 and two convex arc segments 135 respectively arranged on both sides of the concave arc segment 131, and the two ends of the concave arc segment 131 are tangent to the two convex arc segments 135 on both sides, and the two convex arc segments 135 are tangent to the first side 11 and the second side 12 respectively.
[0084] The corner 13 of the embodiment of the present application is configured to be a convex arc segment 135, a concave arc segment 131, and a convex arc segment 131 connected in sequence, and the two convex arc segments 135 are tangent to the first side 11 and the second side 12 respectively, thereby avoiding the formation of a sharp angle between the corner 13 and the first side 11 and the second side 12, and preventing stress concentration.
[0085] In some embodiments, the radius of the concave arc segment 131 is 0.2 mm to 60 mm.
[0086] refer to Figure 3 、 Figure 5 and Figure 7 In some embodiments, the pole piece 10 further includes a pole tab 2 provided on the pole piece body 1. The pole tab 2 is provided on the second side 12. The pole tab 2 is provided on the second side 12 and extends along the length direction X.
[0087] In other embodiments not shown in the drawings, the tab 2 is arranged on the first side 11 .
[0088] In some embodiments, the electrode 10 is a positive electrode. In other embodiments, the electrode 10 is a negative electrode.
[0089] The present application also provides a battery cell including a housing and an electrode assembly disposed within the housing. The electrode assembly includes pole pieces, and the pole pieces are wound or stacked to form the electrode assembly.
[0090] The present application also provides a battery, comprising the above-mentioned battery cell.
[0091] The present application also provides an electrical device, comprising a battery, wherein the battery is used to provide electrical energy.
[0092] according to Figures 3 to 10 The structures of the pole pieces 10 in four specific embodiments of the present application are described in detail.
[0093] Figure 3 and Figure 4 The structure of the pole piece 10 according to the first embodiment of the present application is shown. Figure 5 and Figure 6 The structure of the pole piece 10 according to the second embodiment of the present application is shown. Figure 7 and Figure 8 The structure of the pole piece 10 according to the third embodiment of the present application is shown. Figure 9 and Figure 10The structure of the pole piece 10 according to the fourth embodiment of the present application is shown.
[0094] like Figure 3 and Figure 4 As shown, in the first embodiment, a pole piece 10 includes a pole piece body 1 and a pole tab 2. The pole piece body 1 includes two relatively parallel first edges 11 and two relatively parallel second edges 12. The first edge 11 extends along a length direction X, and the second edge 12 extends along a width direction Y. The pole tab 2 is disposed within the second edge 12. The pole tab 2 can be formed by cutting, welding, or other connecting means.
[0095] The electrode 10 can be a positive electrode or a negative electrode.
[0096] like Figure 4 As shown, the corner 13 between the first side 11 and the second side 12 of the pole piece body 1 of this embodiment is notched. The corner 13 includes two concave arc segments 131 provided at either end and a straight line segment 132 provided between the two concave arc segments 131. The straight line segment 132 is arranged at an angle and is tangent to the two concave arc segments 131 on either side.
[0097] like Figure 5 and Figure 6 As shown, the structure of the pole piece of the second embodiment is different from that of the pole piece of the first embodiment in that the angle 13 between the first side 11 and the second side 12 of the pole piece body 1 of the second embodiment is also a missing angle, and the corner 13 includes two concave arc segments 131, a straight line segment 132 arranged between the two concave arc segments 131, and a vertical connecting segment 133.
[0098] Other undescribed structures of the pole piece of the second embodiment are substantially the same as those of the pole piece of the first embodiment, and therefore are not described again here.
[0099] like Figure 7 and Figure 8 As shown, the structure of the pole piece of the third embodiment differs from that of the pole piece of the first embodiment in that the angle 13 between the first side 11 and the second side 12 of the pole piece body 1 of the third embodiment is also a missing angle, and the corner 13 includes two concave arc segments 131, a straight line segment 132 arranged between the two concave arc segments 131, and a convex arc connecting segment 134. The convex arc connecting segment 134 is tangent to the first side 11 of the pole piece body 1.
[0100] Other undescribed structures of the pole piece of the third embodiment are substantially the same as those of the pole piece of the first embodiment, and thus are not described again here.
[0101] like Figure 9 and Figure 10As shown, the pole piece 10 of the fourth embodiment includes a pole piece body 1 and a pole tab 2. The pole piece body 1 includes a first side 11, a second side 12, and a corner portion 13. The corner portion 13 includes a concave arc segment 131 and two convex arc segments 135 disposed on either side of the concave arc segment 131. The two convex arc segments 135 are tangent to the first side 11 and the second side 12, respectively.
[0102] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.
Claims
1. A pole piece, characterized in that: The invention comprises a pole piece body (1), wherein the pole piece body (1) comprises a first side (11) and a second side (12) arranged adjacent to each other, and a corner portion (13) arranged between the first side (11) and the second side (12), wherein the corner portion (13) comprises at least one concave arc segment (131) concave toward the inner side of the pole piece body (1).
2. The pole piece according to claim 1, characterized in that: The corner portion (13) includes two concave arc segments (131).
3. The pole piece according to claim 2, characterized in that: The corner portion (13) further comprises a straight line segment (132) arranged between the two concave arc segments (131), and the straight line segment (132) is tangent to the concave arc segments (131).
4. The pole piece according to claim 3, characterized in that: The first side (11) extends along the length direction (X) of the pole piece body (1), and the second side (12) extends along the width direction (Y) of the pole piece body (1). The two concave arc segments (131) include a first concave arc segment (131a) arranged close to the first side (11) and a second concave arc segment (131b) arranged close to the second side (12). The first concave arc segment (131a) is connected to the first side (11) via an intermediate connecting segment.
5. The pole piece according to claim 4, characterized in that: The intermediate connecting section includes a vertical connecting section (133) perpendicular to the first side (11).
6. The pole piece according to claim 5, characterized in that: The length of the vertical connecting section (133) is 0.1 mm to 60 mm.
7. The pole piece according to claim 4, characterized in that: The intermediate connecting section comprises a convex arc connecting section (134) protruding toward the outside of the pole piece body (1), and the convex arc connecting section (134) is smoothly connected to the first edge (11).
8. The pole piece according to claim 7, characterized in that: The radius of the convex arc connecting section (134) is 0.2 mm to 60 mm.
9. The pole piece according to claim 1, characterized in that: The corner portion (13) comprises a concave arc segment (131) and two convex arc segments (135) respectively arranged on both sides of the concave arc segment (131), and both ends of the concave arc segment (131) are tangent to the two convex arc segments (135) on both sides.
10. The pole piece according to any one of claims 1 to 9, characterized in that: The radius of the concave arc segment (131) is 0.2 mm to 60 mm.
11. The pole piece according to any one of claims 1 to 9, characterized in that: The pole piece further comprises a pole lug (2) arranged on the pole piece body (1), wherein the pole lug (2) is arranged on the first side (11); or the pole lug (2) is arranged on the second side (12).
12. A battery cell, characterized in that: The invention comprises a shell and an electrode assembly arranged in the shell, wherein the electrode assembly comprises the pole piece according to any one of claims 1 to 11.
13. A battery, characterized in that: Comprising the battery cell according to claim 12.
14. An electrical device, characterized in that: The battery of claim 13 is provided for providing electrical energy.